Knife



- margh 19, 1929.

E. S. PERRY KNIFE Filed 001;. 24, 1927 Patented Mar. 19, 1929.

UNITED STATES EDMUND STEPHEN PERRY, OF CHISLEHURST, ENGLAND.

KNIFE.

Application filed October 24, 1927, Serial No.

The object of the present invention is to provide an improved knife of that kind in which the blade or cutting portion may be readily detached and may be replaced by a new cutting portion without undoing any rivet and without the use of any tools.

According to the present invention the back of the blade proper is supported in a channel shaped carrier. The blade and the. carrier are so formed that a portion of the blade fits behind-a transverse portion of the carrier at its front end.- The blade is capable of being m'ovedthrough an are around the said transverse portion as on a pivot but cannot move laterally away from said carrier. The rear portion of the blade is formed with two rearward projections andthecarrier provided with a cooperating pivoted two armed lever. One arm of the said pivoted two armed lever is employed to rotate the lever and the other arm enters between the two rearward projections. The blade having been engaged at its front end behind the transverse portion of the carrier is then moved around the same until one arm of the two armed lever can enter between the two rearward projections on the blade. The two armed lever is then rotated in one direction to move the rear end of the blade in an arc and to cause it to enter the carrier. The one arm of the two armed lever then presses against one of the rearward projections and holds the rear end of the blade within the channel shaped carrier. lVhen the. two v armed lever is rotated in the opposite direction it will move the rear end of the blade in an arc and cause it to move out of the channel shaped carrier, after which the blade may be drawn backwards out of engagement with the transverse part at the forward end of the channel shaped carrier.

The invention is illustrated in the accompanying drawings in which:

Fig. 1 is a side elevation, and Fig. 2 is av sec tion on the line 22 of Fig. 3 of pocket knife.

Fig. 3 is a front elevation of the same but omitting the cutting blade.

Fig. 4 is a transverse section on the line 4et of'Fig. 1.

Fig. 5 is a side elevation of the blade and carrier showing a modification, and Fig. 6 is a front elevation of the carrier shown in Fig. 5.

Figs. 7 and 8 show parts of the blade and carrier to a larger scale.

an open 228,391, and in Great Britain July 29, 1927.

In the method of carrying the invention into effect shown in Figs. 1 to at the channel shaped carrier a is formed by means of a sheet of metal which is folded upon itself leaving a groove 7) between the two parallel sides sufliciently wide to receive the back edge of the knife blade 0. A portion of one side of the carrier (4 is turned over at a suitable angle at (Z thereby forming a transverse portion 0 at the front end of the carrier. The rear of the carrier at fis wider than that portion a which encloses the back edge of the cutting blade 0,

and in this wider portion of the carrier is pivoted at g a catch h in the form of a two armed lever.

The blade 0 is cut away ati at its front end thereby leaving a forwardly inclined edge At its rear end the blade is cut away at K: thereby leaving two rearward projections Z and m. The front forwardly inclined edge j is placed within the carrier (4 behind the transverse portion thereof which prevents the blade 0 moving forwardly with respect to the carrier and prevents the front end of said blade moving laterally away from said carrier. Theblade c is then rotated so that more of its back edge enters the carrier a. he two armed lever 72, is then rotated on itspivot g which is positioned so that one arm thereof enters the gap k between the two rearward projections Z and m in the rear end of the blade 0. By continuing to rotate the two armed lever h the rear end of the blade 0 is moved through an arc and is pressed within its carrier at and is held therein. In order to withdraw the blade it is only necessary to rotate the lever 71. in the opposite direction, thereby withdrawing the rear end of the blade 0 from its sheath or carrier (2. The end of the outer arm of the two armed lever h is formed with a V shaped notch 72 in which a finger nail may be inserted'to move the same and release the blade 0.

The blade 0 is preferably made of thin metal having projections at 0, 0 on opposite sides so that shavings cut by the blade will pass at similar angles across the blade and will not come into contact with the projecting edges of the carrier a. The projections 0, 0 may be produced in known manner by corrugating the thin metal blade as shown in the drawings.

The invention is'illustrated as applied to a penknife in which the blade 0 is pivoted at p to the handle 9 made of metal, and is adapted to be moved into the usual groove 1- within the handle. The wider portion 7 of the carrier is strengthened by the spacing piece or washer 8 through which passes the pivot 19.

It will be obvious that the carrier amay be rigidly fixed to the handle 9 and such a construction is therefore not illustrated.

In the modification shown in Figs. 5 and 6 the carrier at is an open channelcontorming at its front end to the shape of the blade 0 as seen in Fig. 5. The transverse portion of the carrier a Consists of a pin t which is riveted in'the sides of the channel. The blade 0 has an inclined slot i as in the forms shown in Figs. 1

and 2. The blade 0 is placed within the carrier a by passing the slot 2'- overthe pin t and then rotating the blade after which it ismoved by the two armed lever it into the channel as above described and is retained in said channel by one of the two arms of the lever it.

hat I claim as my invention is 1. An improved knife having in combination a blade, at forwardly inclined edge on said blade, at channelled carrier to receive the back edge of the blade, a transverse part on said carrier behind which passes the forwardlyinclined edge "of the blade, two rearward projections on the rear end of the blade, a pivotedtwo armed lever one arm of which engages between the two rearward projections,

to movethe rearend of theblade into and out of the channelled carrier and to retain the blade in said carrier, and the other arm of which acts as the means tor rotating said'le- *ver, and a handle to which the said carrier, is

connected, substantially as set forth. 2. An improved knife having in combina- U011 a blad e,a forwardly inclined edge on-said blade, a channelled carrier, having parallel sides niade from asheet otinetal folded on itself, to receive the back edge of the blade, a

. transverse part on said carrier formed by tion a'blade, a channelled carrier to'receive the back edge or the blade a handle to which the carrier is connected, co-operating means on the blade and on said carrier to allow the blade to move through an arc'with respect to said carrier and to prevent the front end'oi said blade moving lat'erallyaway from said carrier, two rearward projections on the rear end of the blade and a two armed lever pivoted in said carrier one arm of which, when the twoarmed lever is rotated in' one direction, engages between therearward projections and moves the rear end of the blade through an arc-into the carrier and retains the blade in said carrier and when the. two 'arined lever is rotated in the opposite direction moves the blade through an arc and witl draws the rear end of the blade from the carrier, substantially as set forth.

In witness whereof I have hereunto set my hand. j r

EDldUND STEPHEN PERRY. 

